Optimization of Fin Type and Fin per Inch on Heat Transfer and Pressure Drop of an Air Cooler

Authors: A. Falavand Jozaei, A. Ghafouri

Abstract:

Operation enhancement in an air cooler depends on rate of heat transfer, and pressure drop. In this paper for a given heat duty, study of the effects of FPI (Fin Per Inch) and fin type (circular and hexagonal fins) on heat transfer, and pressure drop in an air cooler in Iran, Arvand petrochemical. A program in EES (Engineering Equations Solver) software moreover, Aspen B-JAC and HTFS+ softwares are used for this purpose to solve governing equations. At first the simulated results obtained from this program is compared to the experimental data for two cases of FPI. The effects of FPI from 3 to 15 over heat transfer (Q) to pressure drop ratio (Q/Δp ratio). This ratio is one of the main parameters in design, and simulation heat exchangers. The results show that heat transfer (Q) and pressure drop increase with increasing FPI steadily, and the Q/Δp ratio increases to FPI=12 and then decreased gradually to FPI=15, and Q/Δp ratio is maximum at FPI=12. The FPI value selection between 8 and 12 obtained as a result to optimum heat transfer to pressure drop ratio. Also by contrast, between circular and hexagonal fins results, the Q/Δp ratio of hexagonal fins more than Q/Δp ratio of circular fins for FPI between 8 and 12 (optimum FPI)

Keywords: Air cooler, circular and hexagonal fins, fin per inch, heat transfer and pressure drop.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1338468

References:

[1] B. Srbislav, M. Branislav, R. Jacimovic, R. Boris Latinovic, “Research on air pressure drop in helically-finned tube heat exchangers,” Applied Thermal Engineering, 2006, vol.26: pp. 478-485.
[2] C. Weierman, J. Taborek, W.J. Marner, “Comparison of the performance of in-line and staggered banks of tubes with segmented fins.” The American Institute of Chemical Engineers Symposium, 1978, 74 (174).
[3] V. Ganapathy, “Industrial Boilers and Heat Recovery Steam Generators: Design, Applications and Calculations,” Marcel Dekker, 2003.
[4] R. K. Shah, D. Sekulic, “Fundamentals of Heat Exchanger Design” , New York: Wiley, 2003.
[5] A. D. Kraus, A. Aziz, J. Welty, “Extended Surface Heat Transfer,” John Wiley & Sons, 2001.
[6] A. Bejan, A. D. Kraus, “Heat Transfer Hand Book,” New York: Wiley, 2003.
[7] API 661, “Standards of American Petroleum Institute,” March 2002, Fifth Edition.